Paper Valve Bags

Paper valve bags are eco-friendly packaging containers designed specifically for automated filling processes. Constructed from multi-layer kraft paper or composite materials, they feature a one-way valve at the bottom. This design enables rapid material filling via mechanical or pneumatic equipment, automatically forming a neat cubic shape that significantly enhances packaging efficiency and stacking stability. As a mainstream industrial packaging solution globally, they are widely used in sectors such as construction materials, chemicals, and food for packaging powdered/granular materials, particularly meeting stringent export requirements for moisture resistance, leak prevention, and aesthetic printing.

1.Custom Printed Kraft Paper Bags Parameters:

Brand: OEM

Material: Paper

Making Process: Composite Packaging Bag

Bag Variety: Upright Bag

Feature: Recyclable

Application: Chemical

Shape: Square Bottom Bag

Raw Materials: Other

2. Key Features

2.1 Innovative Structure: Efficient Filling and Sealing

• Valve Design: The one-way valve at the bottom ensures compatibility with automated filling equipment, achieving filling speeds 3-5 times faster than traditional packaging. Once closed, the valve forms a sealed structure, offering excellent moisture and leak resistance, ideal for moisture-sensitive materials like cement and putty powder.

• Cubic Formation: Automatically forms a neat cubic shape after filling, improving stacking space utilization by 30% and reducing transportation losses.

2.2 Material Science: Balancing Strength and Eco-Friendliness

• Multi-Layer Composite Structure: Utilizes 3-6 layers of kraft paper + PE film composite technology, enhancing tear resistance by 50% and achieving IPX4 moisture resistance rating, suitable for high-humidity transportation environments.

• Lightweight Design: Reduces weight by 20% compared to traditional woven bags under the same load capacity, lowering logistics costs.

2.3 Printing Technology: Branding and Regulatory Compliance

• High-Precision Printing: Supports 1-8 color flexographic printing with a resolution of 300dpi, meeting transparency requirements for food-grade packaging.

• Compliance: Certified by FDA and EU REACH, allowing direct contact with food ingredients such as flour and starch syrup.

2.4 Eco-Friendly and Cost-Effective Advantages

• Recyclability: 100% paper-based material (with optional biodegradable PE film), achieving a 98% waste recycling rate, aligning with carbon neutrality goals.

• Low Waste: Dust leakage rate during valve filling is <0.1%, reducing material waste by 90% compared to traditional open-top bags.

3. Key Specifications and Customization Options

3.1 Basic Specifications Table

3.2 Customization Options

• Material Upgrades: Optional imported kraft paper (tear resistance >15N/15mm) or thickened PE film (thickness 80-200μm).

• Functional Enhancements:

• Antistatic coating (surface resistance <10¹²Ω)

• UV-resistant coating (UV blocking rate >95%)

• Easy-tear design (hot/cold cut)

4. Application Scenarios and Solutions

4.1 Construction Materials Industry: Enhancing Production Efficiency

• Application Scenario: Automated filling of powdered materials such as gypsum powder, putty powder, and tile adhesives.

• Solutions:

• Cubic structure increases stacking density by 25% and container load capacity by 15%.

• Moisture-resistant PE film layer effectively isolates moisture, extending shelf life.

4.2 Chemical Industry: Safety and Regulatory Compliance

• Application Scenario: Packaging of chemical raw materials such as silica and resin.

• Solutions:

• Multi-layer kraft paper + PE film composite structure passes ASTM D4169 transportation tests.

• Valve seal design achieves a leakage rate <0.01%, far below industry standards.

4.3 Food Industry: Combining Safety and Aesthetics

• Application Scenario: Packaging of food-grade materials such as wheat flour, starch syrup, and maltodextrin.

• Solutions:

• Food-grade PE inner lining meets FDA 21 CFR 177.1520 standards.

• High-precision flexographic printing supports multi-color branding and traceability code printing.

5. Cleaning and Maintenance Guidelines

5.1 Equipment Maintenance

• Daily Cleaning: Wipe the packaging machine surface with non-woven fabric to prevent dust accumulation and mechanical failures.

• Lubrication Management: Replace special lubricating oil every 500 hours to ensure smooth valve opening/closing mechanisms.

• Moisture and Corrosion Prevention: Regularly apply anti-rust lubricating oil to prevent metal parts from rusting due to moisture.

5.2 Packaging Storage

• Environmental Control: Store in a dry environment (humidity <60%) to prevent kraft paper from absorbing moisture and deforming.

• Inventory Management: Store unused bags flat in a cool place to avoid material aging from direct sunlight.

6. Frequently Asked Questions (FAQ)

Q1: Are valve bags suitable for food-grade packaging?
A1: Yes, they use food-grade kraft paper and PE film composite materials, complying with FDA standards and safe for contact with food ingredients like wheat flour and starch syrup.

Q2: How do I choose the right valve bag material?
A2: Select based on material characteristics:

• High moisture resistance: Choose kraft paper + PE film composite.

• High load capacity: Opt for multi-layer kraft paper (4-6 layers).

• Export requirements: Prioritize recyclable materials to meet environmental regulations.

Q3: Does the printing process support multi-color printing?
A3: Yes, it supports 1-8 color flexographic/gravure printing for high-precision branding and product information display.

Q4: How stable are valve bags for stacking?
A4: The cubic structure improves stacking space utilization by 30%, and with the bottom valve design, they can be stacked up to 1.5 meters high without collapsing.

Q5: How eco-friendly are valve bags?
A5: They are 100% recyclable with a 98% waste recycling rate, complying with EU EN 13432 compostable standards.

Q6: Are valve bags more durable than traditional packaging?
A6: With a tear resistance test result of ≥15N/15mm, their breakage rate is 70% lower than traditional woven bags, making them ideal for long-distance transportation.

Q7: Do valve bags support customized printing?
A7: Yes, they support 1-8 color flexographic/gravure printing with a minimum order quantity of 5000 bags and a 25-day lead time.

Q8: How do I choose the valve type for valve bags?
A8: Select based on filling equipment type:

Guangdong Yingtong Paper Co., Ltd. (hereinafter referred to as "Guangdong Yingtong") is an influential building material packaging enterprise in South China, representing the advanced level of production of cement paper bags and plastic woven bags, leading the development trend of Cement Packaging Bags; following the development direction of "Made in China 2025"; adhering to the basic strategy of innovation-driven, quality-first and green development and providing integrity packaging solutions and high quality products for building material enterprises.

Established in July 2015, Guangdong Yingtong is located in Xinsha Industrial Zone, Muzhou Town, Xinhui District, Jiangmen City, Guangdong Province. It covers an area of 84 mu with a total investment of over 300 million yuan. There are two production workshops in Yingtong, Guangdong Province, which are Paper Bag workshop and plastic woven bag workshop. All production equipment is imported from Germany. The equipment is advanced for manufacturing cement packaging bags with an annual output of more than 800 million bags (more than 400 million paper bags and plastic woven bags respectively). In China, Guangdong Yingtong ranks first in the production capacity and product quality.